I made a TomTom satnav holder with a lollipop shaped piece of perspex embedded in quick setting cement moulded to the shape of the drivers side cup holder. I bored out some of the cement to reduce weight and strain on the cupholder, but leaving enough weight for it to be very stable. I wrapped the cement in thin polythene to avoid marking the cupholder. This works well, but at night there is a reflection of the screen in the drivers door mirror. Next stage is either angle the screen or an L shaped piece of card attached to the right hand side of the TomTom.